\\[-1.8ex] Soil Heterogeneity & $-$0.616$^{**}$ & $-$0.588$^{**}$ & $-$0.734$^{***}$ & $-$0.683$^{***}$ & $-$0.607$^{***}$ & $-$0.499$^{***}$ & $-$0.386$^{**}$ \\ 
  & (0.268) & (0.271) & (0.238) & (0.240) & (0.182) & (0.177) & (0.154) \\ 
  & & & & & & & \\ 
 Wheat Share$_{t-1}$ &  &  &  &  &  &  & $-$2.704$^{***}$ \\ 
  &  &  &  &  &  &  & (0.184) \\ 
  & & & & & & & \\ 
\\[-1.8ex] 
Observations & 19,531 & 19,531 & 19,531 & 19,531 & 19,531 & 19,502 & 19,502 \\ 
R$^{2}$ & 0.001 & 0.121 & 0.183 & 0.203 & 0.213 & 0.217 & 0.244 \\ 
